This is kind of special problem if you want to transfer existing footnotes. You can do that in MS Word at least. If Google Docs doesn’t offer it then your workflow will be
Obsidian –> Google Docs –> MS Word
since MS Word itself doesn’t offer direct support for markdown. Obviously you want to avoid using MS Word or Google Docs if you can work with Obsidian alone.
If you want to add text to the bottom of the file, then you can use QuickAdd community plugin but I think you meant how your document looks when exported. If you want to have more control while writing then use Pandoc or LaTeX. For general document preparation Obsidian–>Google Docs workflow migth satisfy many needs. This includes images and tables for example. If this FR later implemented Copy-and-paste rendered version (no markdown) from the editor — it might offer better support for Obsidian–>MS Word workflow.